REPORT ON THE LA.MELLIBRANCHIATA. 63 



incurved, the anterior less oblique, and the left valve has a slight keel extending a short 

 distance oblicpely from the umbones which does not occur in the three specimens 

 examined by Carpenter. These differences probably would not prove constant could we 

 study a large number of examples. In its excessive flatness and the character of the 

 hinge it perfectly corresponds with this species. Ccelodon delicatulus} a Japanese 

 species, has a similar umbonal ridge, but is rather different in form, and has another 

 description of hinge. 



Myochama, Stutchbury. 

 Myochama anomioides, Stutchbury. 



Myochama anomioides, Stutclibury, Zool. Journ., vol. v. p. 9Y, Tab. Suppl. 42, figs. 1-4. 

 Myochama anomioides, Hancock, Ana. and Mag. Nat. Hist., 1853, vol. xi. p. 287, pi. xi. 



(animal). 

 Myochama anomioides, Chenu, Man. Conch., vol. ii. p. 52, fig. 219. 

 Myochama anomioides, Woodward, Man. Moll., pi. xxiii. fig. 13. 

 Myochama anomioides, Reeve, Conch. Icon., fig. 4c only. 



Myochama liejypelliana, A. Adams, Proo. Zool. Soc. Lond., 18.52, p. 90, pi. xv. fig. 1. 

 Myochama liepjM'lUaiia, Reeve, Conch. Icon., fig. 2. 



Habitat. — Port Jackson on Pectunculus holosericus and Trigonia lamarckii, in 2 to 

 10 fathoms; also at Station 162, off East Moncceur Island, Bass Strait, in 38 fathoms; 

 sand and shells ; on Pectuncidus beddomei. 



I do not find any good characters distinguishing Stutchbury's Myochama anomi- 

 oides and the Myochama keppelliana of A. Adams, and I am also inclined to think that 

 another set of species so-called, namely, Myochama stutchhuryi, A. Adams, Myochama 

 tahida, Reeve, and Myochama tra)7sversa, A. Adams, merely differ from the rest 

 in having the radiating costse finer. I feel, however, no hesitation in pronouncing the 

 three last mentioned forms as one and the same. The remaining species, Myochama 

 strangei of A. Adams, is a very distinct shell from any of those mentioned above, 

 having a peculiarly WTinkled and malleated surface, and moreover of a different colour. 

 I would here remark that Reeve is totally wrong in placing Myochama transversa as a 

 synonym of Myochama strangei, the latter being correctly figured on PI. I. fig. \h. 



The type of Myochama transversa still preserved in the Cumingian collection, does 

 not appear in Reeve's Monograph, but was first of all figured in the Proc. Zool. Soc. Lond., 

 1850, pi. viii. fig. 1, the drawing being enlarged, and subsequent!}^ in the same work for 

 1852, pi. XV. fig. 3, this figure representing the specimen of its natural size. I do not 

 agree with Reeve in considering the right hand specimen of figure 3 on his plate distinct 

 from the shell on the left, both in my opinion being forms of Myochama transversa, also 

 represented by figs. 4a and 46, Myochama anomioides being delineated by fig. 4c only. 



» (A. Adams, MS.\ Carpenter, Proc. Zoo}. Soc. Lond., 1864, p. GCO. 



